Question- For steady state flow to a fully penetrating well in a confined aquifer, the drawdown at radial distances 1.56m and 1.80m from the well have been measured as 4.92m and 5.45m respectively, for a pumping rate of 36 cumec. The transmissivity (m²/s) of the aquifer is equal wwwwwwwm to

Question- For steady state flow to a fully penetrating well in a confined aquifer, the drawdown at radial distances 1.56m and 1.80m from the well have been measured as 4.92m and 5.45m respectively, for a pumping rate of 36 cumec. The transmissivity (m²/s) of the aquifer is equal wwwwwwwm to

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Groundwater Flow

The term groundwater refers to the water which is found beneath the earth's surface. Pores present in the soil and rocks with fractures make a passage for rainwater to enter the earth's surface and deposit as groundwater. The flow nature and direction of groundwater under the earth's surface directly impacts the strength and compressibility of the soil, which reflects its ability to support structural loads.

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For steady state flow to a fully penetrating well in a confined aquifer, the drawdown at radial
distances 1.56m and 1.80m from the well have been measured as 4.92m and 5.45m
respectively, for a pumping rate of 36 cumec. The transmissivity (m²/s) of the aquifer is equal
to

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Example 5.23 Two 30 cm wells completely penetrate an artesian aquifer of thickness 15 m ell decreases. spaced at 200 m. Permeability of the aquifer is 60 m/day. When one well is pumped at and are the rate 2000 Ipm, the drawdown in the well is 5 m. Assume a radius of influence of 300m and steady state conditions. What will be the discharge when both the wells are pumped keeping the drawdown at 5 m. If a third well is located at 200 m to form an equilateral triangle and all the three wells pumped keeping the drawdown at 5 m, what is the percentage reduction in discharge ? What is the percentage reduction in discharge if another well is added to form a square ?
(b) | A 400 mm diameter well fully penetrates a confined aquifer of thickness 20 m is pumped at a constant rate of 2500 m/day. The drawdown in the pumping well is observed as 4 m and the radius of influence is at a distance of 100 m. (i) Calculate the transmissivity of the aquifer; (ii) Determine the hydraulic conductivity of the aquifer material and draw the neat sketch of the well
A 30cm diameter well fully penetrates an unconfined aquifer with saturated thickness ho=60m and hydraulic conductivity K-9x10-3 m/min, calculate the drawdown at point k and the drawdown at the pumping well, assume ro=120m near an impervious boundary. The well is being pumped at a constant rate of 1.5m³/min. Pw 30m k 50m 35m Impervious boudary
Question- For steady state flow to a fully penetrating well in a confined aquifer, the drawdown at radial distances 1.56m and 1.80m from the well have been measured as 4.92m and 5.45m respectively, for a pumping rate of 36 cumec. The transmissivity (m²/s) of the aquifer is equal to
Exercise1 A 30 cm well penetrates 30 m below static water level. After a long period of pumping at a rate of 1800 lit/min, the drawdowns in the observation wells at 12 m and 36 m from the pumped well are 1.2 m and 0.5 m, respectively. Determine: A. The transmissibility of the aquifer B. The drawdown in the pumped well assuming R = 300 m. C. The specific capacity of the well.
a 45-cm well in an unconfined aquifer of saturated thickness of 48 m yields 701 lpm (liters per minute) under a drawdown of 4m at the pumping well. Assuming a radius of influence of 605 m, a. what is the hydraulic conductivity of the aquifer, in m/day? b. what will be the drawdown 200m from the well? c. what will be the piezometric head 400m fron the well?
B- A 20cm diameter well penetrates fully a confined aquifer of thickness 25m .when the well is pumped at a rate of 200 liters/ minute the drawdown in two observaƟons wells located at 10m and 100m distance from center of well are found to be 3.5m and 0.05 m respectively .calculate the hydraulic conductivity of the aquifer and the radius of influence and the drawdown in the well.?
Q2) A fully penetrating well of diameter 0.3 m is located in an uncontined aquifer of saturated depth 45 m. If the drawdown in the well is 15 m for the discharge of 1200 m³/day and the radius of influence is 300 m, compute hydraulic conductivity?
TELEGRAM Q1: A 30cm diameter well penetrates vertically through an aquifer to an impermeable stratum located 18.0 m below the static water table. After a long period of pumping at a rate of 1.2 m3/min, the drawdown in test holes 11m and 35 m from the pumped well is found to be 3.05 and 1.62m respective. What is the hydraulic conductivity of the aquifer? Express in meters per day. What is its transmissivity? Express in cubic meters per day per meter. What is the drawdown in the pumped well?
A 30 cm well is pumped at the rate of 1000 ipm. The transmissibility of the aquifer is o.015 m²/s. If the well is located at a distance of 120 m from a stream, what should be the drawdown? (i) In the pumping well- (ii) In an observation well 80 m away from the pumping well on the side opposite to the stream? (iii) In an observation well 80 m away from the pumping well, on a line parallel to the stream?
A 20-cm well ponetrates 30 m below static water level (GWT). After a long period of pumping at a rate of 1800 Ipm, the drawdowns in the observation wells at 12 m and 36 m from the pumped well are 1.2 m and 0.5 m, respectively. Determine: (1) (1) the transmissibility of the aquifer. the drawdown in the pumped well assuming R = 300 m. the specific capacity of the well
a) A 30-cm well completely penetrates an artesian aquifer. The length of the strainer* is 25 m. Determine the discharge from the well when the drawdown at the pumping well is 4.0 m. The coefficient of permeability of the aquifer is 45 m/day. Assume the radius of influence of the well is 350 m. *length of strainer = thickness of the aquifer b) A 30-cm well fully penetrates an unconfined aquifer of saturated depth 25 m. When a discharge of 2100 Ipm was being pumped for a long time, observation wells at radial distances of 30 m and 90 m indicated drawdown of 5 and 4 m respectively. i. Estimate the coefficient of permeability and transmissibility of the aquifer. ii. What is the drawdown at the pumping well? *Ipm = liters per minute *h = H - s, where H = saturated depth